He will never be the first player from UB drafted into the NBA. That honor goes to Bob Vartanian. He was drafted in the 13th round of the 1973 NBA Draft by the Buffalo Braves.
https://www.basketball-reference.com/draft/NBA_1973.html
https://www.thedraftreview.com/index.php?option=com_content&view=article&id=10441&catid=73&Itemid=342
Standard operating procedure to keep extending coaches every year. The failure to extend can be seen as a vote of no confidence.
For full explanation read a March to Madness by John Feinstein.
Another way to look at this is recruiting, recruiting and more recruiting.